In a mixture of 35 liters, the ratio of milk and water is 4 : 1. How many liters of water must be added to make the ratio 2 : 3?

Raju, Rinku and Ram can do a piece of work in 6, 12, and 24 days respectively. In what time will they finish the work while working together ?

If a, b and c are in GP and a^1/x=b^1/y=c^1/z. The value of 2y is?

A number, on subtracting 15 from it reduces to its 80 %. What is 40 % of the number? 

The smallest number which when divided by 18, 24, 38 and 42 leaves the remainder 15, 21,     35 and 39 respectively is :-

A book seller allowed 10 % discount on printed price. He gets 30 % commission from publisher. His profit in percent will be? 

What should be added to $$ {10 \ over 11} $$ to get the sum $$ {11 \ over 10} $$?

A can make a cupboard in 20 days and B can do it in 60 days . Along with C , they did the job in 10 days only . Then in how many days C alone can do the job ?